Metal complexes of azomethines

ABSTRACT

Metal complexes of azomethines of the formula ##STR1## are useful for coloring plastics and lacquers in yellow to red shades of excellent fastness properties.

This is a divisional of application Ser. No. 773,990, filed on Mar. 3, 1977, now U.S. Pat. No. 4,132,708, issued Jan. 2, 1979; which is a divisional of application Ser. No. 545,457, filed on Jan. 30, 1975, now U.S. Pat. No. 4,022,770, issued May 10, 1977.

The invention provides novel, useful metal complexes of azomethines and a process for their manufacture which comprises treating an azomethine of the formula ##STR2## wherein R₁ represents a hydrogen atom, an alkyl or an aryl group, R₂ represents an isocyclic or a heterocyclic radical with a hydroxy group adjacent to the azomethine group, or R₁ and R₂ together with the carbon atom of the azomethine group represent a 5- or 6-membered heterocyclic ring which may be fused with benzene nuclei, each of X₁ and X₂ independently represents alkyl, cycloalkyl, aralkyl or aryl radicals or together X₁ and X₂ represent a fused carbocyclic or heterocyclic aromatic ring and Y represents the radical of a compound containing active methylene groups, of a heterocyclic amine or of a hydrazide, with an agent which donates bivalent metal.

In formula (I) as well as in the formulae listed hereinafter, reference is made to only one of all possible tautomeric or mesomeric structures.

Preferably, there are used as starting compounds azomethines of the formula ##STR3## wherein R₁, R₂ and Y have the meanings already assigned to them, Hal represents a halogen atom, Y₅ represents an oxygen or a sulphur atom, R₅ represents an unsubstituted or a substituted alkyl, cycloalkyl or aryl group, Z represents a hydrogen atom, m, n and p are integers from 0 to 4 and the sum of m+n+p is 4.

Compounds of especial interest are azomethine metal complexes of the formula ##STR4## and, in particular, those of the formula III wherein Y represents the radical of a compound containing active methylene groups and especially the radical of the formula ##STR5## In the formulae (III) and (IV), A represents an isocyclic or a heterocyclic radical, R₃ represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, M₁ represents a Ni, Cu, Co or Zn atom and a cyano group, R₄ represents an acyl, an alkoxycarbonyl, a carbamoyl or a sulphamoyl group or a radical of the formula ##STR6## wherein V represents an oxygen or a sulphur atom or an imino group, Y₂ and Y₃ represent hydrogen or halogen atoms, alkyl or alkoxy groups of 1 to 4 carbon atoms or nitro groups.

Particularly preferred azomethine complexes are those of the formula ##STR7## wherein R₃, R₄, M₁, Y₂ and Y₃ have the meanings already assigned to them and Y₄ represents an oxygen or a sulphur atom or a NH group.

Preferred metal complexes of azomethines are also those of the formula ##STR8## wherein Y has the meaning previously assigned to it, Z₁ and Z₃ represent hydrogen or halogen atoms, alkoxy or alkylmercapto groups of 1 to 6 carbon atoms, cycloalkyl groups of 5 to 6 carbon atoms, aralkoxy, aryloxy or arylmercapto groups, Z₂ and Z₄ represent hydrogen or halogen atoms, and one of the substituents Z₁ to Z₄ can also be a nitro group, and, in particular, those wherein Y represents a radical of the formula ##STR9## in which R₄ has the meaning previously assigned to it.

Preferred metal complexes of azomethines are also those of the formulae II and III wherein Y represents a radical of the formulae ##STR10## wherein Y₂, Y₃ and Y₄ have the meanings previously assigned to them and R₆ represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms or a phenyl radical which is unsubstituted or a phenyl radical which is substituted by halogen atoms, alkyl or alkoxy groups of 1 to 4 carbon atoms.

The azomethines used as starting materials (ligands) are in part known compounds. They are obtained by known processes, for example by

(a) condensation of a compound of the formula ##STR11## with a hydrazone of the formula ##STR12## or by

(b) condensation of a compound of the formula ##STR13## with a compound of the formula H₂ Y, in which formulae X₁, X₂, R₁, R₂ and Y have the meanings previously assigned to them, or by

(c) condensation of a hydrazone of the formula ##STR14## with an oxo compound of the formula ##STR15## or the anil thereof of the formula ##STR16## wherein Ph represents an unsubstituted or substituted phenyl radical.

The compounds of the formula (VI) are obtained by condensation of an amino-imine of the formula ##STR17## with a heterocyclic primary amine, a compound containing active methylene groups or with a hydrazide.

The compounds of the formula (VIII) are obtained by condensation of an amino-imine of the formula (IX) with a hydrazone of the formula (VII).

The compounds of the formula (VIIIa) are obtained by condensation of the compound of the formula (VI) with hydrazine.

The manner in which the ligands are manufactured can exert a substantial influence on their physical and colouristic properties and on their metal complexes.

Examples of amino-imines of the formula (IX) are:

2-amino-3,4-dichloro-pyrrolenine

2-amino-5-imino-3,4-dimethyl-pyrrolenine

2-amino-5-imino-3,4-diethyl-pyrrolenine

2-amino-5-imino-3,4-dicyclohexyl-pyrrolenine or

2-amino-5-imino-3,4-diphenyl-pyrrolenine.

Particular interest, however, attaches to the 1-amino-3-imino-isoindolenines of the formula ##STR18## wherein Hal, RY, Z, m, n and p have the meanings previously assigned to them.

As examples there may be mentioned principally the unsubstituted 1-amino-3-imino-isoindolenine, also

4,5,6,7-tetrachloro-1-amino-3-imino-isoindolenine,

5,6-dichloro-1-amino-3-imino-isoindolenine,

4,5,7-trichloro-6-methoxy-1-amino-3-imino-isoindolenine

4,5,7-trichloro-6-ethoxy-1-amino-3-imino-isoindolenine

4,5,7-trichloro-6-phenoxy-1-amino-3-imino-isoindolenine

5,7-dichloro-4,6-dimethoxy-1-amino-3-imino-isoindolenine

5,7-dichloro-4,6-diphenoxy-1-amino-3-imino-isoindolenine

4,5,7-trichloro-6-methylmercapto-1-amino-3-imino-isoindolenine

4,5,7-trichloro-6-phenylmercapto-1-amino-3-imino-isoindolenine

1-amino-3-imino-4,5-benz-isoindolenine

4,5,6,7-tetraphenoxy-1-amino-3-imino-isoindolenine

5- or 6-methyl-1-amino-3-imino-isoindolenine

5- or 6-phenyl-1-amino-3-imino-isoindolenine

4- or 7-chloro-1-amino-3-imino-isoindolenine

5- or 6-chloro-1-amino-3-imino-isoindolenine

5,6-dichloro-1-amino-3-imino-isoindolenine

4- or 7-nitro-1-amino-3-imino-isoindolenine

5- or 6-nitro-1-amino-3-imino-isoindolenine

5- or 6-methoxy-1-amino-3-imino-isoindolenine

5- or 6-ethoxy-1-amino-3-imino-isoindolenine

5- or 6-phenoxy-1-amino-3-imino-isoindolenine

5- or 6-methylmercapto-1-amino-3-imino-isoindolenine

5- or 6-methylsulphonyl-1-amino-3-imino-isoindolenine

5- or 6-acetylamino-1-amino-3-imino-isoindolenine

As further amino-imino-isoindolenines there may be cited:

1-amino-3-imino-4,7-dithia-4,5,6,7-tetrahydro-isoindolenine and 1-amino-3-imino-4,7-diaza-isoindolenine.

The cited 1-amino-3-imino-indolenines can be obtained, for example, from the corresponding phthalonitriles by treatment with liquid ammonia or from the dicarboxylic imides via the 1,3,3-trichloro-isoindolenines, which are subsequently reacted with ammonia.

The phthalonitriles which contain alkoxy, phenoxy or alkylmercapto groups can be obtained from the tetrachlorophthalonitrile by reaction with an alkali alcoholate, phenolate or mercaptide in a hydrophilic organic solvent.

The reaction of the cited 1-amino-3-iminoisoindolenines with heterocyclic amines to manufacture the compound of the formula (VI) is carried out desirably in the molar ratio 1:1 in a polar organic solvent, preferably an alcohol, such as methanol, ethanol, isobutanol or methyl cellosolve, at temperatures between 50° and 120° C.

The heterocyclic primary amines are preferably those in which the primary amino group is located directly at a 5- or 6-membered heterocyclic ring which can contain 3 nitrogen atoms and in addition oxygen and sulphur atoms. A benzene nucleus which may be substituted or unsubstituted can be fused to the heterocyclic parent nucleus. As examples there may be cited.

2-aminothiophene

2-aminothiazole

2-amino-5-nitrothiazole

2-amino-5-methylsulphonyl-thiazole

2-amino-5-cyanothiazole

2-amino-4-methyl-5-nitrothiazole

2-amino-4-methylthiazole

2-amino-4-phenylthiazole

2-amino-4-(4'-chloro)-phenylthiazole

2-amino-4-(4'-nitro)-phenylthiazole

3-aminopyrazole

3-amino-1-phenylpyrazole

3-aminoindazole

5-methylsulphonyl-2-aminothiazole

5-benzoyl-2-aminothiazole

2-aminoimidazole

4,5-dicyano-2-aminoimidazole

4,5-diphenyl-2-aminothiazole

2-amino-3,4-thiadiazole

2-amino-3,5-thiadiazole

3-amino-1,2,4-triazole

2-amino-3,4-oxadiazole

3-aminopyridine

2-aminopyridin-N-oxide

2-amino-benzthiazole

2-amino-6-chloro-benzthiazole

2-amino-6-methyl-benzthiazole

2-amino-6-methoxy-benzthiazole

2-amino-6-chloro-4-nitrobenzthiazole

2-amino-6-bromo-4-cyanobenzthiazole

2-amino-6-cyano-4-methylbenzthiazole

2-amino-6-methyl-4-nitrobenzthiazole

2-amino-6-methoxy-4-nitrobenzthiazole

2-amino-6-butoxy-4-chlorobenzthiazole

2-amino-4-chloro-5-methoxybenzthiazole

2-amino-4-bromo-6-methoxybenzthiazole

2-amino-4,6-dichlorobenzthiazole

2-amino-4,6-dibromobenzthiazole

2-amino-4-methyl-6-(trifluoromethyl)-benzthiazole

2-amino-4-methyl-6-propionylbenzthiazole

2-amino-4-chloro-6-(methylsulphonyl)-benzthiazole

3-aminobenzisothiazole

3-amino-5-chloro-benzisothiazole

2-amino-3-cyano-tetrahydrobenzthiophene

2-amino-benzimidazole

2-amino-6-chloro-benzimidazole

2-amino-6-bromo-benzimidazole

2-amino-6-methyl-benzimidazole

2-amino-6-methoxy-benzimidazole

2-amino-6-ethoxy-benzimidazole

2-amino-6-methylsulphonyl-benzimidazole

2-amino-6-acetylamino-benzimidazole

Instead of reacting the compounds of the formulae (VIII) or (IX) with amines, it is also possible to react them with compounds containing active methylene groups.

The compounds containing active methylene groups can be classified as follows:

(a) Substituted acetonitriles, in particular those of the R₄ CH₂ CN, wherein R₄ has the meaning already assigned to it.

Examples of simply substituted acetonitriles are:

malonitrile

cyanoacetic acid methyl, ethyl, propyl or butyl ester

cyanoacetamide

cyanoacetic acid methylamide or ethylamide

cyanoacetic acid phenylamide

α-cyano-dimethyl ketone

cyanomethyl ethyl ketone

α-cyanoacetophenone

phenylacetonitrile

phenylsulphonylacetonitrile

phenylsulphamoylacetonitrile

sulphamoyl.

Examples of heterocyclic substituted acetonitriles are:

2-cyanomethyl-oxazole

2-cyanomethyl-thiazole

2-cyanomethyl-imidazole

2-cyanomethyl-1,2,3-triazole

2-cyanomethyl-4-hydroxy-quinazoline

2-cyanomethyl-benzoxazole

2-cyanomethyl-benzthiazole

2-cyanomethyl-benzimidazole

2-cyanomethyl-5-chlorobenzimidazole

2-cyanomethyl-5-nitrobenzimidazole

2-cyanomethyl-5,6-dimethylimidazole

2-cyanomethyl-5-ethoxyimidazole

2-cyanomethyl-5,6-dichloroimidazole

2-cyanomethyl-5-methoxyimidazole

2-cyanomethyl-dihydro-quinazolone-4

and the compound of the formula ##STR19##

(b) Pyridines, quinolines, cumarins and pyrimidines, for example:

4-methyl-2,6-dioxo-tetrahydro-pyridine

4-methyl-5-cyano-2,6-dioxo-tetrahydro-pyridine

4-methyl-5-carbamoyl-2,6-dioxo-tetrahydro-pyridine

4-methoxycarbonyl-2,6-dioxo-tetrahydro-pyridine

1,4-dimethyl-2,6-dioxo-tetrahydro-pyridine

1-phenyl-4-methyl-2,6-dioxo-tetrahydro-pyridine

4,6-dioxo-tetrahydro-pyrimidine

1,3-dioxo-tetrahydro-isoquinoline

4-hydroxycumarin

(c) Barbituric acid and derivatives, for example:

barbituric acid

methyl-, ethyl- or phenylbarbituric acid

2-thiobarbituric acid

2-iminobarbituric acid

1-phenylbarbituric acid

1,3-dimethylbarbituric acid

1,3-diphenylbarbituric acid

1-methylbarbituric acid

(d) Pyrazolones, for example:

3-methyl-pyrazolone-5

1-phenyl-3-methyl-pyrazolone-5

3-methoxycarbonyl-pyrazolone-5

1-phenyl-3-carbamoyl-pyrazolone-5

(e) Imidazoles, oxazoles, isoxazoles and thiazoles, for example:

oxazolone-5

2-methyl-oxazolone-5

2-phenyl-oxazolone-5

isoxazolone-5

3-methyl-isoxazolone-5

3-phenyl-isoxazolone-5

imidazolidin-2,4-dione

3-methyl-benzthiazoline.

The condensation of the compounds of the formula (VIII) or (IX) with the compounds containing active methylene groups is effected desirably at temperatures between 10° and 110° C. in an organic solvent, expediently in a hydrophilic organic solvent, especially in an aliphatic alcohol, for example methanol, propanols, butanols, glycols and glycol monoethers or in acetic acid, if appropriate in mixtures with water.

Instead of compounds containing active methylene groups, it is also possible to condense hydrazides, for example the hydrazides of aliphatic monocarboxylic acids containing 2 to 4 carbon atoms or, in particular, the hydrazides of the formula ##STR20## wherein Y₂ and Y₃ have the meanings previously assigned to them, with the imines of the formulae VIII or IX.

The condensation of the hydrazides with the compounds of the formulae VIII or IX is desirably carried out in water or in an organic solvent at elevated temperature, preferably between 50° C. and the boiling point of the solvent employed. Examples of solvents are: water, alcohol, glacial acetic acid, dioxan, dimethyl formamide, N-methylpyrrolidone, butylrolacetone, glycol monomethyl etheer, xylene, chlorobenzene, o-dichlorobenzene, nitrobenzene or mixtures thereof.

The reaction according to process (a) of the compounds of the formula (VI) with the hydrazones of the formula VII, preferably with those of the formula ##STR21## wherein A and R₃ have the indicated meanings, is carried out at temperatures between 50° and 130° C. in an organic solvent and diluent.

Suitable solvents and diluents are polar organic solvents, above all those which are miscible with water, such as alcohols, N,N-dimethyl formamide, N,N-diethyl formamide, N,N-diethyl acetamide, N,N-dimethyl acetamide, N-methylpyrrolidone, glacial acetic acid, formic acid, glycol monomethyl ether, glycol monoethyl ether or mixtures thereof.

The hydrazones, the majority of which are known compounds, are obtained by reaction of the corresponding oxo compound of the formula ##STR22## or aldimines thereof of the formula ##STR23## wherein R₁ and R₂ have the indicated meanings and Ph represents an unsubstituted or a substituted phenyl radical, in particular those of formula ##STR24## wherein R₃ and Ph have the indicated meanings, by known processes with hydrazine hydrate.

The oxo compounds of the formula ##STR25## or the aldimines thereof can belong to both the aromatic and the heterocyclic class.

Particularly interesting oxo compounds are those of the formula ##STR26## wherein Y₂, Y₃ and Y₄ have the meanings already assigned to them, R₇ represents a hydrogen atom or a methyl group, and especially the hydroxyquinolines or hydroxycumarins of the formulae. ##STR27## wherein R₇, Y₂ and Y₃ have the indicated meanings.

Particular attaches also to the compounds of the following formulae ##STR28## wherein R₇ has the meaing previously assigned to it, R₈ represents a cyano, alkoxycarbonyl group or a carbamoyl group and R₉ represents a hydrogen atom, an alkyl, aryl or a hydroxy group, ##STR29## wherein Y₂, Y₃, R₇ and R₈ have the meanings assigned to them hereinbefore, ##STR30## wherein Y₂, Y₃ and R₇ have the meanings assigned to them hereinbefore, and also hydroxynaphthaldehydes of the formula ##STR31## wherein Y₆ represents a hydrogen atom, a carboxy or a carbamoyl group, an alkoxycarbonyl or alkylcarbamoyl group containing 2 to 6 carbon atoms, an phenylcarbamoyl group which is unsubstituted or which is substituted in the phenyl moiety by halogen atoms or alkyl or alkoxy groups of 1 to 4 carbon atoms, Y₇ represents a hydrogen or a halogen atom, a methoxy, nitro or cyano group, or pyrazoles of the formula ##STR32## wherein Y₂ and Y₃ have the indicated meanings, Q represents a methyl group or an alkoxycarbonyl group containing 2 to 5 carbon atoms or a carbamoyl group.

The following aldehydes or ketones may be cited as examples:

(1) o-hydroxybenzaldehydes:

salicylaldehyde

4-chloro-2-hydroxybenzaldehyde

5-chloro-2-hydroxybenzaldehyde

3-nitro-2-hydroxybenzaldehyde

5-nitro-2-hydroxybenzaldehyde

3,5-dichloro-2-hydroxybenzaldehyde

3,5-dibromo-2-hydroxybenzaldehyde

5-phenylazo-2-hydroxybenzaldehyde

5-(2'-chloro-phenylazo)-2-hydroxybenzaldehyde

5-(2',5'-dichloro-phenylazo)-2-hydroxybenzaldehyde

5-(2'-methyl-phenylazo)-2-hydroxybenzaldehyde

5-(2'-methoxy-phenylazo)-2-hydroxybenzaldehyde

5(2'-methoxy-4'-nitro-phenylazo)-2-hydroxybenzaldehyde

5-(2'-methoxy-5'-carbamoyl-phenylazo)-2-hydroxybenzaldehyde

(2) Hydroxynaphthaldehydes:

2-hydroxynaphthaldehyde

6-bromo-2-hydroxynaphthaldehyde

5-nitro-2-hydroxynaphthaldehyde

2-hydroxy-3-carboxy-naphthaldehyde

2-hydroxy-3-methoxycarbonyl-naphthaldehyde

2-hydroxy-3-phenylcarbamoyl-naphthaldehyde

2-hydroxy-3-(4'-chlorophenylcarbamoyl)-naphthaldehyde

2-hydroxy-3-(4'-chloro-2'-methylphenylcarbamoyl-naphthaldehyde

2-hydroxy-3-(2',5'-dimethoxy-3'-chloro-phenylcarbamoyl-napthaldehyde

2-hydroxy-6-bromo-3-carboxynaphthaldehyde

2-hydroxy-6-bromo-3-phenylcarbamoylnaphthaldehyde.

(3) Heterocyclic aldehydes and ketones:

2,6-dihydroxy-4-methyl-5-cyano-3-pyridinaldehyde

2,6-dihydroxy-4-methyl-5-carbamoyl-3-pyridinaldehyde

2,4-dihydroxy-3-quinoline aldehyde

5-chloro-2,4-dihydroxy-3-quinoline aldehyde

6-chloro-2,4-dihydroxy-3-quinoline aldehyde

7-chloro-2,4-dihydroxy-3-quinoline aldehyde

8-chloro-2,4-dihydroxy-3-quinoline aldehyde

6,8-dichloro-2,4-dihydroxy-3-quinoline aldehyde

7,8-dichloro-2,4-dihydroxy-3-quinoline aldehyde

6-methyl-2,4-dihydroxy-3-quinoline aldehyde

7-methyl-2,4-dihydroxy-3-quinoline aldehyde

8-methyl-2,4-dihydroxy-3-quinoline aldehyde

6-chloro-8-methyl-2,4-dihydroxy-3-quinoline aldehyde

2,4-dihydroxy-3-acetyl-quinoline

2,4-dihydroxy-3-acetyl-6-methyl-quinoline

2,4-dihydroxy-3-acetyl-6-chloro-quinoline

3-hydroxy-isoquinoline-4-aldehyde

5-formyl-bartituric acid

2-methyl-4,6-dihydroxy-5-pyrimidine aldehyde

2-phenyl-4,6-dihydroxy-5-pyrimidine aldehyde

4-hydroxy-3-quinaldine aldehyde

6-chloro-4-hydroxy-3-quinaldine aldehyde

6-methoxy-4-hydroxy-3-quinaldine aldehyde

4-hydroxycumarin-3-aldehyde

6-methyl-4-hydroxycumarin-3-aldehyde

6-methoxy-4-hydroxycumarin-3-aldehyde

6-chloro-4-hydroxycumarin-3-aldehyde

5,7-dimethyl-6-chloro-4-hydroxycumarin-3-aldehyde

1-phenyl-3-methyl-4-formyl-pyrazolone-5

1-phenyl-3-carboxy-4-formyl-pyrazolone-5

1-phenyl-3-methoxycarbonyl-4-formyl-pyrazolone-5

1-phenyl-3-ethoxycarbonyl-4-formyl-pyrazolone-5

1-(2'-chlorophenyl)-3-methyl-4-formyl-pyrazolone-5

1-(4'-chlorophenyl)-3-methyl-4-formyl-pyrazolone-5

1-(2'-methylphenyl)-3-methyl-4-formyl-pyrazolone-5

1-(4'-methylphenyl)-3-methyl-4-formyl-pyrazolone-5

1-phenyl-3-carbamoyl-4-formyl-pyrazolone-5

As hydrazones of the formula (VII) it is also possible to use those of the formula ##STR33## wherein Z₁ to Z₄ have the meaings previously assigned to them. These are obtained by reaction of hydrazine with an isoindolinone of the formula ##STR34## wherein Z₁ to Z₂ have the meanings previously assigned to them, V₁ represents a group of the formula ##STR35## wherein Z₈ represents an imino or a thio group and both symbolds Z₉ represents halogen atoms, alkoxy or secondary amino groups

As starting materials there are preferably used 3-imino-isoindolinone or 3,3'-dialkoxy-iminoisoindolinones of the formula ##STR36## wherein Z₁ to Z₄ have the meanings previously assigned to them and R' represents an alkyl group of 1 to 4 carbon atoms. Those starting materials in which Z₁ to A₄ represent chlorine atoms or hydrogen atoms are known, and those in which Z₁ and Z₃ represent alkoxy, cycloalkoxy, aralkoxy, aryloxy, alkylthio or arylthio groups and Z₂ and Z₄ represent chlorine atoms can be obtained by reaction of an ammonium salt or ester of tetrachloro-o-cyanobenzoic acid in a hydrophilic organic solvent with a compound of the formula Z₁ M₃, wherein Z₁ has the meaning previously assigned to it and M₃ represents an alkali metal atom, and, if necessary, esterifying the resultant product.

Examples of isoindolinones are:

3,3-dimethoxy-4,5,6,7-tetrachloro-isoindolinone

3,3-dimethoxy-4,5,6,7-tetrabromo-isoindolinone

3,3,6-trimethoxy-4,5,7-trichloro-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-butoxy-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-phenoxy-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-(p-chlorophenoxy)-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-(o-methylphenoxy)-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-methylmercapto-isoindolinone

3,3-dimethoxy-4,5,7-trichloro-6-ethylmercapto-isoindolinone

3,3,4,6-tetramethoxy-5,7-dichloro-isoindolinone

3,3-dimethoxy-4,7-dichloro-isoindolinone

3,3-dimethoxy-4-nitro-isoindolinone

3,3-dimethoxy-5-nitro-isoindolinone

3,3-dimethoxy-4-fluoro-isoindolinone

3,3-dimethoxy-7-iodo-isoindolinone

3-imino-isoindolinone

5-chloro-3-imino-isoindolinone

5,6-dichloro-3-imino-isoindolinone

The ligands can also be manufactured by process modification (b), i.e. by condensation of a compound of the formfula (VIII) with a compound of the formula H₂ Y.

It is preferred to use as starting material a compound of the formula ##STR37## wherein the symbols have the meanings previously assigned to them. As compounds of the formula H₂ Y it is desirable to use the compounds containing active methylene groups, heterocyclic amines or hydrazides cited hereinbefore. The reaction is desirably carried out in a polar organic solvent at temperatures between 50° and 120° C.

Compounds of the formula ##STR38## wherein the symbols have the meansings previously assigned to them, are preferably used as starting materials. The aldehydes or ketones or anils thereof cited hereinbefore can be preferably used as oxo compounds. The reaction is carried out preferably at temperatures between 50° and 130° C. in the above mentioned organic solvents and diluents.

Since the ligands are sparingly soluble as a rule in the solvents used for the reaction, it is possible to isolate them easily by filtration. Any impurities can be removed by washing off.

The ligands are converted into the metal complexes by treating them with agents which donate bivalent metals, for example with salts of zinc, cadmium, maganese, cobalt, iron, but especially for copper and nickel or mixtures of such metals. Preferably, the formiates, acetates or stearates of these metals are used. The metallising takes place, for example, in water, if appropriate with the addition of a dispersant, but desirably in one of the solvents cited hereinbefore.

A further embodiment of the process according to the invention consists in

(a) condensing a hydrazone of the formula VII with a compound of the formula VI (single step process I), or

(b) condensing a compound of the formula VIII with a compound of the formula H₂ Y, wherein Y has the indicated meaning (single step process II), or

(c) condensing a hydrazine of the formula VIIIa with an oxo compound of the formula ##STR39## or the anil thereof (single step process III), in the presence of an agent which donates a bivalent metal.

These different metallising processes are able to result in metal complexes with different physical and colouristic properties. In principle, each of the single step processes I, II and III yields the same metal complexes as the metallising of the ligands obtained according to processes (a), (b) and (c).

The novel colourants constitute useful pigments which, in finely divided form, may be used for pigmenting organic material of high molecular weight, for example cellulose ethers and esters, polyamides and polyurethanes or polyesters, acetyl cellulose, nitrocellulose, natural resins or synthetic resins, such as polymerisation or condensation resins, for example aminoplasts, in particular urea and melamine/formaldehyde resins, alkyl resins, phenolic plastics, polycarbonates, polyolefins, such as polystyrene, polyvinyl chloride, polyethylene, polypropylene, polyacrylonitrile, polyacrylic esters, rubber, casein, silicon and silicone resins, individually or in mixtures.

It is immaterial whether the cited materials of high molecular weight are in the form of plastics, melts or in the form of spinning solutions, lacquers or printing inks. Depending on the use to which they are put, it is advantageous to use the novel pigments as toners or in the form of preparations.

The resultant colourations are characterised by good general pigment properties, especially by good fastness to light and migration and weathering, and frequently by great brilliance of shade which is surprising for metal complexes and by high colour strength.

The following Examples illustrate the invention, the parts and percentages being by weight unless otherwise stated.

EXAMPLE 1

A mixture of 15.15 g (0.05 mole) of 1-cyano-carbanilidomethylene-3-hydrazinoisoindoline (prepared from 1-cyanocarbanilidomethylene)-3-imino-isoindoline and hydrazine) and 9.45 g (0.05 mole) of 3-formyl-2,4-dihydroxyquinoline is stirred in 200 ml of glacial acetic acid for 2 hours at 100° C. The reaction mixture is filtered off hot. The filter residue is thoroughly washed with glacial acetic acid and ethanol and dried at 100° C in vacuo. Yield: 21.5 g (90.7% of theory) of a yellowish orange pigment of the composition C₂₇ H₁₈ N₆ O₃ and of the formula ##STR40## (only one of the possible isomeric or tautomeric forms has been considered). The reaction of the resultant ligand with nickel acetate.4H₂ O (theory + 10% surplus) in 600 ml of methylcellosolve over the course of 3 hours at 110° C leads to a 1:1 Ni²⁺ complex which colours PVC and lacquers in orange red shades of excellent fastness to light, weathering and migration.

    ______________________________________                                         Microanalysis: C.sub.27 H.sub.16 N.sub.6 NiO.sub.3 (MG 531)                               C      H        N        Ni                                         ______________________________________                                         % estimated  61.05    3.04     15.82  11.05                                    % found      60.6     3.1      16.0   10.8                                     ______________________________________                                    

Instead of using methyl cellosolve, it is also possible to use carbitols, glycols, dimethyl formamide or dimethyl sulphoxide for the metallising. If the metal complexes are not dried at a higher temperature than 100° C in vacuo, they contain normally 0.5 to 2 moles of water of crystallisation.

The 1:1 metal complexes of the formula given below (only one of the possible isomeric or tautomeric forms has been considered for the sake of simplicity), in which M₁, A and X have the meanings indicated in Table 1, are synthesised according to the process of Example 1. The starting materials can be manufactured by known methods.

                  TABLE I                                                          ______________________________________                                          ##STR41##                                                                      Example                                                                               M.sub.1.sup. 2+                                                                        X                                                                                    ##STR42##       PVC Shade in                             ______________________________________                                         2      Ni.sup.2+                                                                              Cl                                                                                    ##STR43##      scarlet                                   3      Ni.sup.2+                                                                              H                                                                                     ##STR44##      scarlet                                   4      Ni.sup.2+                                                                              H                                                                                     ##STR45##      red                                       5      Ni.sup.2+                                                                              H                                                                                     ##STR46##      orange                                    6      Cu.sup.2+     "               yellowish                                                                      brown                                     ______________________________________                                    

EXAMPLE 7

A mixture of 15.15 g (0.05 mole) of 1-cyano-carbanilidomethylene)-3-hydrazinoisoindoline (prepared from 1-(cyanocarbanilidomethylene)-3-imino-isoindoline and hydrazine) and 9.45 g (0.05 mole) of 3-formyl-2,4-dihydroxyquinoline, to which is then added 13.75 g (0.055 mole) of nickel acetate. 4H₂ O, is stirred in 500 ml of methyl cellosolve for 3 hours at 110° C. The reaction mixture is filtered off hot. The filter residue is thoroughly washed with methyl cellosolve and ethanol and dried at 80° C. in vacuo. Yield: 10.5 g 838.9% of theory) of an orange red nickel complex of the same composition (+0.5 mole of water of crystallisation) and pigment properties as in Example 1.

    ______________________________________                                         Microanalysis: C.sub.27 H.sub.16 N.sub.6 NiO.sub.3 . 0,5 H.sub.2 O (Mg         540)                                                                                      C      H        N        Ni                                         ______________________________________                                         % estimated  60.0     3.1      15.55  10.8                                     % found      59.8     3.2      15.3   10.8                                     ______________________________________                                    

Instead of using methyl cellosolve it is also possible to use carbitols, glycols, dimethyl formamide or dimethyl sulphoxide. If the metal complexes are not dried at a temperature higher than 100° C. in vacuo they normally still contain 0.5 to 2 moles of water of crystallisation.

The metal complexes of the formula given below (only one of the possible tautomeric or isomeric forms has been considered), in which M₁, Y, R₃ and A have the meanings given in Table II, are synthesised according to the single step process of Example 7. Some of the starting products are known or can be manufactured by known methods. Column 6 indicates the ratio of metal to ligand.

    __________________________________________________________________________      ##STR47##                                                                      Example                                                                             M.sub.1.sup.2+                                                                     Y               R.sub.3                                                                           ##STR48##    M.sub.1 /L                                                                         in PVCShade                      __________________________________________________________________________     8    Cu.sup.2+                                                                           ##STR49##      H                                                                                  ##STR50##   1/1 yellow- ish brown                 9    Ni.sup.2+                                                                           ##STR51##      H  "            1/1 scarlet                           10   Ni.sup.2+                                                                           ##STR52##      H  "            1/2 yellow- ish orange                11   Ni.sup.2+                                                                           ##STR53##      H  "            1/1 orange                            12   Ni.sup.2+                                                                           ##STR54##      H  "            1/1 red                               13   Cu.sup.2+                                                                          "               H  "            1/1 brown                             14   Ni.sup.2+                                                                           ##STR55##      H  "            1/1 orange red                        15   Cu.sup.2+                                                                           ##STR56##      H                                                                                  ##STR57##   1/1 brown                             16   Ni.sup.2+                                                                           ##STR58##      H  "            1/1 red                               17   Ni.sup.2+                                                                           ##STR59##      H                                                                                  ##STR60##   1/1 scarlet                           18   Ni.sup.2+                                                                           ##STR61##      H  "            1/2 red                               19   Ni.sup.2+                                                                           ##STR62##      H  "            1/1 orange                            20   Ni.sup.2+                                                                           ##STR63##      H  "            1/1 red                               21   Ni.sup.2+                                                                           ##STR64##      H  "            1/1 reddish brown                     22   Ni.sup.2+                                                                           ##STR65##      H                                                                                  ##STR66##   1/1 orange                            23   CU.sup.2+                                                                          "               H  "            1/1 brown                             24   Ni.sup.2+                                                                           ##STR67##      H  "            1/1 yellowish orange                  25   Cu.sup.2+                                                                          "               H  "            1/1 yellowish                                                                      brown                             26   Ni.sup.2+                                                                           ##STR68##      H  "            1/1 red                               27   Ni.sup.2+                                                                           ##STR69##      H  "            1/1 orange                            28   Ni.sup.2+                                                                           ##STR70##      H  "            1/1 reddish brown                     29   Ni.sup.2+                                                                           ##STR71##      H                                                                                  ##STR72##   1/1 scarlet                           30   Ni.sup.2+                                                                           ##STR73##      H  "            1/1 red                               31   Ni.sup.2+                                                                           ##STR74##      H  "            1/1 orange                            32   Ni.sup.2+                                                                          "               H                                                                                  ##STR75##   1/1 orange                            33   Ni.sup.2+                                                                           ##STR76##      H  "            1/1 orange                            34   Ni.sup.2+                                                                           ##STR77##      H  "            1/1 red                               35   Ni.sup.2+                                                                           ##STR78##      H                                                                                  ##STR79##   1/1 orange                            36   Ni.sup.2+                                                                           ##STR80##      H  "            1/1 orange                            37   Ni.sup.2+                                                                           ##STR81##      H  "            1/1 red                               38   Ni.sup.2+                                                                           ##STR82##      H                                                                                  ##STR83##   1/1 red                               39   Ni.sup.2+                                                                          "               H                                                                                  ##STR84##   1/1 red                               40   Ni.sup.2+                                                                           ##STR85##      CH.sub.3                                                                           ##STR86##   1/1 red                               41   Cu.sup.2+                                                                          "               CH.sub.3                                                                          "            1/1 brown                             __________________________________________________________________________

EXAMPLE 42

A mixture of 14.4 g (0.05 mole) of 1-(cyano-carbanilidomethylene)-3-imino-isoindoline and 10.15 g (0.05 mole) of 3-formyl-2,4-dihydroxyquinoline-hydrazone (prepared by known methods) is stirred in 200 ml of glacial acetic acid for 1 hour at 95° C. The reaction mixture is filtered off hot. The filter residue is thoroughly washed with glacial acetic acid and ethanol and dried at 100° C. in vacuo. Yield: 21.3 g (89.8% of theory) of an orange pigment of the same composition (C₂₇ H₁₈ N₆ O₃) as the ligand in Example 1, but of other physical properties, such as UV, VIS, IR spectra and fragmentation in the mass spectrum. The reaction of the resultant ligand with nickel acetate.4H₂ O (theory+10% surplus) in 600 ml of methyl cellosolve over the course of three hours at 110° C. leads, as in Example 1, to a 1:1 Ni²⁺ complex of the composition C₂₇ H₁₆ N₆ NiO₃, which colours PVC and lacquers in claret shades of good fastness to light and migration.

Instead of methyl cellosolve it is also possible to use carbitols, glycols, dimethyl formamide or dimethyl sulphoxide for the metallising.

If the metal complexes are not dried at a temperature higher than 100° C. in vacuo, they normally still contain 0.5 to 2 moles of water of crystallisation. The metal complexes of the formula given below (only one of the possible isomeric or tautomeric forms has been considered for the sake of simplicity), in which M₁, Y, R₃ and A have the meanings given in Table III, are synthesised according to the process of Example 42. Some of the starting materials are known or they can be manufactured by known methods. Column 6 indicates the ratio of metal to ligand.

                                      TABLE III                                    __________________________________________________________________________      ##STR87##                                                                      pleExam-                                                                           M.sub.1.sup.2+                                                                     Y               R.sub.3                                                                           ##STR88##       M.sub.1 /L                                                                         PVCShade                       __________________________________________________________________________                                                    in                              43  Ni.sup.2+                                                                           ##STR89##      H                                                                                  ##STR90##      1/1 brown                           44  Cu.sup.2+                                                                            "             H  "               1/1 brown                           45  Ni.sup.2+                                                                           ##STR91##      H  "               1/1 red                             46  Cu.sup.2+                                                                            "             H  "               1/1 brown                           47  Ni.sup.2+                                                                           ##STR92##      H  "               1/1 yellowish brown                 48  Cu.sup.2+                                                                            "             H  "               1/1 brown                           49  Cu.sup.2+                                                                           ##STR93##      H  "               1/1 reddish brown                   50  Ni.sup.2+                                                                           ##STR94##      H  "               1/1 claret                          51  Cu.sup.2+                                                                            "             H  "               1/1 claret                          52  Ni.sup.2+                                                                           ##STR95##      H  "               1/2 claret                          53  Cu.sup.2+                                                                            "             H  "               1/1 claret                          54  Ni.sup.2+                                                                           ##STR96##      H  "               1/1 claret                          55  Cu.sup.2+                                                                            "             H  "               1/1 violet                          56  Ni.sup.2+                                                                           ##STR97##      H  "               1/1 violet                          57  Ni.sup.2+                                                                           ##STR98##      H                                                                                  ##STR99##      1/1 claret                          58  Cu.sup.2+                                                                            "             H  "               1/1 red                             59  Ni.sup.2+                                                                           ##STR100##     H                                                                                  ##STR101##     1/1 yellowish orange                60  Cu.sup.2+                                                                          "               H  "               1/1 brown                           61  Ni.sup.2+                                                                            "             H                                                                                  ##STR102##     1/1 red                             62  Cu.sup.2+                                                                            "             H  "               1/1 brown                           63  Ni.sup.2+                                                                            "             H                                                                                  ##STR103##     1/1 red                             64  Cu.sup.2+                                                                            "             H  "               1/1 brown                           65  Co.sup.2+                                                                            "             H  "               1/1 claret                          66  Ni.sup.2+                                                                           ##STR104##     H  "               1/1 reddish brown                   67  Cu.sup.2+                                                                            "             H  "               1/1 brown                           68  Ni.sup.2+                                                                           ##STR105##     H  "               1/1 brown                           69  Cu.sup.2+                                                                            "             H  "               1/1 brown                           70  Cu.sup.2+                                                                           ##STR106##     H                                                                                  ##STR107##     1/1 brown                           71  Ni.sup.2+                                                                          "                H                                                                                 ##STR108##     1/1 claret                          72  Cu.sup.2+                                                                            "             H  "               1/1 brown                           73  Ni.sup.2+                                                                          "               CH.sub.3                                                                           ##STR109##     1/1 red                             74  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 brown                           75  Co.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 brown                           76  Ni.sup.2+                                                                           ##STR110##     CH.sub.3                                                                          "               1/1 red                             77  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 red                             78  Ni.sup.2+                                                                           ##STR111##     CH.sub.3                                                                          "               1/1 reddish brown                   79  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 reddish                                                                        brown                           80  Ni.sup.2+                                                                           ##STR112##     CH.sub.3                                                                          "               1/2 reddish brown                   81  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 brown                           82  Ni.sup.2+                                                                           ##STR113##     CH.sub.3                                                                          "               1/1 claret                          83  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 violet                          84  Ni.sup.2+                                                                           ##STR114##     CH.sub.3                                                                          "               1/1 red                             85  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 violet                          86  Ni.sup.2+                                                                           ##STR115##     CH.sub.3                                                                          "               1/1 violet                          87  Cu.sup. 2+                                                                           "             CH.sub.3                                                                          "               1/1 claret                          88  Ni.sup.2+                                                                           ##STR116##     CH.sub.3                                                                          "               1/2 yellow                          89  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/2 yellow                          90  Cu.sup.2+                                                                           ##STR117##     CH.sub.3                                                                          "               1/1 brown                           91  Ni.sup.2+                                                                           ##STR118##     CH.sub.3                                                                           ##STR119##     1/1 red                             92  Cu.sup.2+                                                                          "               CH.sub.3                                                                          "               1/1 brown                           93  Ni.sup.2+                                                                           ##STR120##     CH.sub.3                                                                          "               1/1 red                             94  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 reddish                                                                        brown                           95  Ni.sup.2+                                                                           ##STR121##     CH.sub.3                                                                          "               1/1 claret                          96  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 red                             97  Ni.sup.2+                                                                           ##STR122##     CH.sub.3                                                                           ##STR123##     1/1 yellowish orange                98  Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 yellow                          99  Ni.sup.2+                                                                           ##STR124##     CH.sub.3                                                                          "               1/1 red                             100 Cu.sup.2+                                                                            "             CH.sub.3                                                                          "               1/1 red                             101 Ni.sup.2+                                                                           ##STR125##     CH.sub.3                                                                           ##STR126##     1/1 brown                           12  Cu.sup.2+                                                                          "               CH.sub.3                                                                          "               1/1 brown                           __________________________________________________________________________

EXAMPLES 103-107

The 1:1 copper (II) complexes of the formula given below, in which X₁ and X₂ have the meanings given in the Table, are synthesised according to the process of Example 42. The starting materials are known or they can be manufactured by known methods.

    ______________________________________                                          ##STR127##                                                                     Example                                                                                   ##STR128##       PVCinShade                                        ______________________________________                                         103                                                                                        ##STR129##      yellowish brown                                    104                                                                                        ##STR130##      brown                                              105                                                                                        ##STR131##      brown                                              106                                                                                        ##STR132##      reddish brown                                      107                                                                                        ##STR133##      yellowish brown                                    ______________________________________                                    

EXAMPLE 108

A fine suspension of 6.62 g (0.02 mole) of the bishydrazone I (prepared by known methods from 3-formyl-2,4-dihydroxyquinoline, hydrazine and 1,3-diimino-isoindoline) of the formula ##STR134## (only one of the possible isomeric or tautomeric forms has been considered) and 2.56 g (0.02 mole) of barbituric acid in 200 ml of glacial acetic acid is prepared and stirred for 2 hours at 100° C. The reaction mixture is filtered off hot. The filter residue is thoroughly washed with glacial acetic acid and ethanol and dried at 100° C. in vacuo. Yield: 7.15 g (80.8% of theory) of an orange pigment of the composition C₂₂ H₁₄ N₆ O₅ and of the formula Ii ##STR135## (only one of the possible isomeric or tautomeric forms has been considered). The reaction of the resultant ligand II with nickel acetate.4H₂ O (theory+10% surplus) in dimethyl formamide over the course of 4 hours at 110° C. leads to a 1:1 Ni²⁺ complex of the composition C₂₂ H₁₂ N₆ NiO₅ (% Ni est. 11.8; found 11.8). This pigment colours PVC and lacquers in red shades of excellent fastness to migration, light and weathering. The metallising can also be effected simultaneously during the condensation of I with barbituric acid.

The 1:1 metal complexes of the formula given below (for simplicity's sake only one of the possible isomeric or tautomeric forms has been considered), in which M₁ and R₃ have the meanings indicated in Table IV, are synthesised according to the process of Example 108. The starting materials can be manufactured by known methods.

                  TABLE IV                                                         ______________________________________                                          ##STR136##                                                                    Example  M.sub.1.sup.2+                                                                            R.sub.3   Shade in PVC                                     ______________________________________                                         109      Cu.sup.2+  H         brown                                            110      Ni.sup.2+  CH.sub.3  reddish brown                                    111      Cu.sup.2+  CH.sub.3  yellowish brown                                  ______________________________________                                    

EXAMPLE 112

1:1 Ni²⁺ complex of ##STR137## For simplicity's sake only one of the possible isomeric or tautomeric forms has been considered.

Manufacture of the Ligand

A mixture of 5.7 g (0.02 mole) of 1-(cyano-benzimidazolylmethylene)-3-imino-isoindoline and 5.8 g (0.02 mole) of 4,6-dichloro-3,5-dimethoxy-isoindolin-1-on-3-ylidene-hydrazine is heated in 250 ml of glacial acetic acid for 20 minutes to 80° C. The red pigment is filtered off hot, washed with glacial acetic acid and alcohol and dried at 80° C. in vacuo. Yield: 8.7 g (78% of theory) of a product of the above formula which analysis shows to be pure.

Manufacture of the Ni²⁺ Complex

1.68 g (0.003 mole) of the bishydrazone are suspended in 50 ml of methyl cellosolve and the suspension, together with 0.75 g (0.003 mole) of nickel acetate.4H₂ O, is heated for 4 hours to 100° C. The red suspension is filtered off hot and the filter product is thoroughly washed with methyl cellosolve, alcohol and acetone and dried at 100° C. in vacuo. Yield: 1.55 g (84% of theory) of a pigment of the composition C₂₇ H₁₅ Cl₂ N₇ NiO₃. This pigment colours PVC and lacquers in brilliant red shades of excellent fastness to light and migration.

By analogous methods metal complexes are manufactured with the ligands of the formula ##STR138## wherein M₁, Y, R₁ and R₂ have the meanings given in Table II. Column 5 indicates the ratio of metal to ligand.

    __________________________________________________________________________        pleExam-                                                                         M.sub.1.sup.2+                                                                     Y                                                                                                ##STR139##      M.sub.1 /L                                                                         PVCinShade                      __________________________________________________________________________     113 Cu.sup.2+                                                                           ##STR140##                                                                                       ##STR141##     1/1 red                              114 Co.sup.2+                                                                          "                 "               1/1 reddish                                                                        brown                            115 Ni.sup.2+                                                                           ##STR142##       "               1/1 reddish brown                    116 Cu.sup.2+                                                                          "                 "               1/1 brown                            117 Ni.sup.2+                                                                           ##STR143##                                                                                       ##STR144##     1/1 red                              118 Cu.sup.2+                                                                          "                 "               1/1 red                              119 Co.sup.2+                                                                           ##STR145##       "               1/1 claret                           120 Ni.sup.2+                                                                          "                                                                                                 ##STR146##     1/1 reddish brown                    121 Cu.sup.2+                                                                          "                 "               1/1 brown                            122 Co.sup.2+                                                                          "                 "               1/1 brown                            123 Ni.sup.2+                                                                           ##STR147##                                                                                       ##STR148##     1/1 orange                           124 Cu.sup.2+                                                                          "                 "               1/1 yellow                           125 Ni.sup.2+                                                                           ##STR149##       "               1/1 brown                            126 Cu.sup.2+                                                                          "                 "               1/1 brown                            127 Ni.sup.2+                                                                           ##STR150##                                                                                       ##STR151##     1/2 red                              128 Cu.sup.2+                                                                          "                 "               1/2 reddish                                                                        brown                            129 Ni.sup.2+                                                                           ##STR152##                                                                                       ##STR153##     1/1 red                              130 Cu.sup.2+                                                                          "                 "               1/1 brown                            131 Ni.sup.2+                                                                           ##STR154##                                                                                       ##STR155##     1/1 red                              132 Cu.sup.2+                                                                          "                 "               1/1 brown                            133 Ni.sup.2+                                                                          "                                                                                                 ##STR156##     1/1 red                              134 Cu.sup.2+                                                                          "                 "               1/1 red                              135 Ni.sup.2+                                                                          "                                                                                                 ##STR157##     1/1 red                              136 Cu.sup.2+                                                                          "                 "               1/1 reddish                                                                        brown                            137 Ni.sup.2+                                                                           ##STR158##                                                                                       ##STR159##     1/1 reddish brown                    138 Cu.sup.2+                                                                          "                 "               1/1 brown                            139 Cu.sup.2+                                                                           ##STR160##                                                                                       ##STR161##     1/1 brown                            __________________________________________________________________________

EXAMPLE 140

A mixture of 5.7 g (0.02 mole) of 1-(cyano-benzimidazolylmethylene)-3-iminoisoindoline, 5.8 g (0.02 mole) of 4,6-dichloro-3,5-dimethoxy-isoindolin-1-on-3-ylidene-hydrazine and 5.0 g (0.02 mole) of nickel acetate.4H₂ O is heated in 250 ml of glacial acetic acid for 4 hours to 100° C. The red suspension is filtered off hot and the filter residue is thoroughly washed with glacial acetic acid, alcohol and acetone and dried in vacuo at 100° C. A pigment of similar properties as in Example 112 is obtained.

EXAMPLE 141

5.7 g (0.02 mole) of 1-(cyano-benzimidazolyl-methylene)-3-imino-isoindoline and 5.0 g (0.02 mole) of nickel acetate.4H₂ O are reacted for 30 minutes at 50° C. in 250 ml of glacial acetic acid. Then 5.8 g (0.02 mole) of 4,6-dichloro-3,5-dimethoxyisoindolin-1-on-3-ylidene-hydrazine are added and the suspension is heated for 4 hours to 100° C. The red suspension is filtered off hot and the filter residue is thoroughly washed with glacial acetic acid, alcohol and acetone and dried in vacuo at 100° C. A pigment of similar properties as in Example 112 is obtained.

EXAMPLE 142

A mixture of 10 g of titanium dioxide and 2 g of the pigment manufactured according to Example 1 is ground for 48 hours in a ball mill with 88 g of a mixture of coconut alkyl resin, 24 g of melamine/formaldehyde resin (50% solids content), 8,8 g of ethylene glycol monomethyl ether and 28.8 g of xylene.

By spraying this lacquer onto a aluminium sheet, predrying it for 30 minutes at room temperature and then stoving it for 30 minutes at 120° C. there is obtained a scarlet finish which is characterised by very good fastness to overstripe bleeding, light and weathering. 

We claim:
 1. An azomethine metal complex of the formula ##STR162## in which R₃ is alkyl of 1 to 4 carbon atoms, M₁ is Ni, Cu, or Zn; and A is a radical for the formulae ##STR163## in which Q is methyl, alkoxycarbonyl with 2 to 5 carbon atoms or carbamoyl, R₈ is cyano, or carbamoyl, R₉ is hydrogen, or hydroxy, Y₂ and Y₃ are hydrogen, halogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, or nitro, Y₄ is --NH--, Y₆ is hydrogen, carboxy, carbamoyl, alkoxycarbamoyl of 2 to 6 carbon atoms, alkylcarbamoyl of 2 to 6 carbon atoms, phenylcarbamoyl, phenylcarbamoyl substituted in the phenyl moiety by halogen, alkyl of 1 to 4 carbon atoms, or alkoxy of 1 to 4 carbon atoms, Y₇ is hydrogen, halogen, methoxy, nitro or cyano.
 2. An azomethine metal complex according to claim 1 of the formula ##STR164## wherein R₃ is methyl and M₁ is Ni or Cu. 